Haha its ok, its a carry over from ARMA, it allows you to make marks that only your squad can see (marking on "group") that only your side can see ("side") and ones that everyone can see ("Global" useful for taunting the enemy)

The trick is you can only combine certain maps with each other to make a full map.

A NE and NW map can be combined to make a N map. A SE and a SW map can be combined to make a S map. A N(orth) map and a S(outh) map can be combined to make a full map! Drag in drop stuff.

A SE and a NW map can't be combined. That's where people get hung up. A NE and a S map can't be combined. It's gotta follow the pattern I wrote. Then you put it on your hotkey bar and press the corresponding hotkey. Presto, map!

Eh, nothing major really. It has topographical information which is great. It gives you something to look at when you're taking a very long hike which is cool (but books do the same thing for you). But a full map only takes up one inventory slot and when you've got full bags that one single slot isn't so big of a deal.

Maps are something useful and if you're using house rules they're great. But dont' expect too much.